Rudy, M., D. Kristina, and S. S. Tarjana. “MEASURING SPOKEN VOCABULARY LOAD ON MEDICAL ENGLISH STUDENTS: A LEARNER CORPUS EVALUATION”. International Online Journal of Education and Teaching, vol. 6, no. 4, Oct. 2019, pp. 774-87, https://iojet.org/index.php/IOJET/article/view/595.